How to show a file insert button in the editor?

I have configured the SilverStripe CMS for one of my sites. In the content editor i have seen that there is an option for inserting Images and Flash objects. Like that i want to insert MP3 files in to the content. How i can achieve this. Since i am a newbie to this CMS, I have searched in the forum and all. But i cant get any help from it.